Deliberate mistake: At the beginning, Asajj Ventress is wearing an outfit with a long skirt. When she is rescued from her damaged starfighter by the scavengers, the skirt has vanished. This was done because the animators found the skirt too difficult to animate. This is also why she receives a brand new outfit that never had a long skirt later in the episode. (00:08:20)
Continuity mistake: Besides Obi-Wan, Even Piell and Commander Cody, the exact number of people in Obi-Wan's group keeps changing.
Other mistake: During Padmé's big speech to the Senate, Duchess Satine is visible in the background watching at one point. Satine is the ruler of Mandalore, a neutral planet, not a Senator, and thus has no reason to be present at a normal session of the Galactic Senate.
Suggested correction: Mandalorian is neutral in the war, but they are still a member of the Republic Senate.
Continuity mistake: The intro states Aurra Sing is presumed dead on Florrum by the Jedi, but the Aurebesh writing in the archives states she was 'last seen on Coruscant'. Impossible. Perhaps the archives are incomplete? (00:03:33)
Continuity mistake: R2's squad of battle droids has three members. Yet in the climactic fighting of the previous episode, one of the droids was shown getting destroyed.
Continuity mistake: After Obi-Wan's group has abseiled down the wall of the prison, two of the clone troopers in armour are carrying Separatist blasters instead of the Republic-issue blasters they had before and after. (00:09:38)
Continuity mistake: When the possessed Ahsoka declares that Anakin will be forced to kill her and Force-pulls one of her lightsabers into her right hand, said hand changes positions between the wide shot and the following close-up. (00:12:28)
Clone Cadets - S3-E1
Continuity mistake: During the first training test, when Fives and Cutup have an exchange where the former tells the latter to flank right and gets a bad pun in response, Cutup is wearing Echo's practice armour (with a number 3 on it) instead of his own, which is marked with a 4. (00:10:38)
The Citadel - S3-E18
Continuity mistake: Just after Ahsoka says "clear" when they're sneaking around the prison, her Padawan braid is missing again. (00:13:40)
Continuity mistake: When Ahsoka takes cover in the trees after the Trandoshan ship opens fire, her Padawan braid is missing. (00:07:05)
Continuity mistake: When Ahsoka is boarding the rescue gunship, her normally green lightsaber has a blue blade. (00:18:00)
Continuity mistake: While training Savage, Dooku uses the Force to levitate a number of stone obelisks. While he's doing that, there's a closeup of Savage where an obelisk that is shown floating in the preceding and successive shots is visible behind him not floating. (00:03:36)
The Citadel - S3-E18
Continuity mistake: When the commando droids enter the cell where Piell's officers were being held, the damage on the door from Anakin stabbing a commando droid with his lightsaber through it is gone. (00:19:20)
The Citadel - S3-E18
Continuity mistake: When Ahsoka asks Master Plo if she can speak with him, her Padawan braid (the beaded chain hanging on the back of her head below her right horn) is missing. (00:04:05)
Continuity mistake: When Ahsoka suggests that Chairman Papanoida's daughters might be being held on the Trade Federation ship blockading Pantora, she refers to it as a planet. "Trespass" established that Pantora is a moon. (00:06:47)
Continuity mistake: When Anakin and Padmé are walking towards her ship while discussing the situation, as happens with surprising frequency, Rex, walking behind them, is missing his kama (the kilt). (00:04:35)
Continuity mistake: When Baron Papanoida walks into Jabba's court, his half-cape is missing. (00:10:24)
The Academy - S3-E6
Plot hole: When Ahsoka rushes to save the students when they arrive to meet the prime minister, she attacks several secret police officers, who flee afterwards. However, we later see her standing next to the prime minister acting innocent when she pretends to side with him. The officers she fought earlier would no doubt have told Almec what side Ahsoka is really on, so her ploy never should have worked to begin with. (00:11:55 - 00:13:40)